Speed-changing mechanism.



PATENTED OCT. 16, 1906.

J. METGALPE. SPEED CHANGING MECHANISM.

APPLICATION FILED AUG.17, 1905.

4 SHEETS-SHEET l.

TuT/T/l ress es No. 833,330. PATENTED OCT. 16, 1906.

J. METGALPE. SPEED CHANGING MECHANISM.

APPLICATION FILED AUG.17, 1905.

4 SHEETSSHEET 2,

OK/WVW PATENTED OCT. 16, 1906.

J. METCALPE. SPEED CHANGING MECHANISM.

APPLICATION FILED AUG. 17, 1905.

4 SHEETS-SHEET 3.

PATENTED OCT. 16, 1906.

J. METGALFE. SPEED CHANGING MECHANISM.

APPLICATION FILED AUG.17, 1905.

4 SHEETS-SHEET 4.

7 i 24 Mi 7////A ig/M I mxf m Y 1 el-calj UNI ED STATES PATENT OFFICE.

- JOHN METCALFE OF WORCESTER, MASSACHUSETTS. ASSIGNOR OF ONE- HALF TO F. REED COMPANY, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

. modification.

. mechanism SPEED-CHANGING MECHANISM.

Specification of Letters Patent.

Patented Oct. 16, 1906.

Application filed August 17, 1905. Serial No. 274,636-

To all whom it may concern: I

Be it known that I, JOHN METOALEE, a citizen of the United States, residing, at Worcester, in the county of Worcester and State of Massachusetts, have invented a new and useful speed Changing Mechanism, of which the following is a specification.

The object of this invention is to provide a new and improved change-speed earing by which the gear ratio between two s afts may be varied in a simple and expeditious manner.

The mechanism has been particularly designed for use on screw-cutting engine-lathes, although it may be applied and adapted to anydmachine where such mechanism can be use The invention is shown in the accompanying four sheets of drawings, referring to which A Figure 1 is an end elevation of the mechanism. Fig. 2 is a sectional elevation taken on the line 2 2 of Fig. 1. Fig. 3 is a sectional plan view taken on the line 3 3 of Fig. 1. Fig. 4 is a sectional plan view. Fig. 5 isa sectional elevation of the o erating mechanism. Fig. 6 is a sectiona plan view of a Fig. 7 is a sectional plan view thereof. Fi .8is an end view of the locking thereof, and Fig. 9 is a detail hereinafter referred to.

Referring to the drawings and in detail, I will describe my invention in its application to an engine-lathe.

A designates the bed of the lathe, on which is mounted the usual head-stock B, journaled in which is the usual spindle C. Fitting on the spindle is a pinion 10. Journaled in a bearing formed in the head-stock is a bushing 11, havi a plate 12, carrying studs on which are ournaled the usual two intermeshing tumbler-pinions 13 and 14. The bushing 11 'is secured to a lever 15, by adjusting which either tumbler 13 or 14 can be brought into mesh with the pinion 10.. This arrangement is a common one and is used so as to drive the parts in either direction, as desired.

Journaled in said bushing 11 and in the hearing formed in the head-stock is a shaft 16, secured on which is a gear 17, with which the tumblerinion 14 engages. Fitting on the end of sald shaft 16 is a quill 18, which is keyed to said shaft 16 and which is free to slide axially thereon. Secured to the quill are gears 19 and 20 of diflerent diameters. The end of the quill 18 is provided with a knob so that the same can be slid axially. A ear-box D is shown'as secured to the end of t e bed, and the said quill 18 is j ournaled at its end in said box. J ournaled in said box below the shaft 16 is a shaft 21, rigidly secured on which are gears 22, 23, and 24.

The large gear 19 on the quill will be meshed with the gear 23 as shown in Fig. 2, when the quill is pushed in, and when the quill is pulled out the smallgear 20 will be meshed with the gear 22. speeds can be imparted to the shaft 21 from the shaft 16.

Journaled in bearings formed in the box below the shaft 21 is a shaft 25. This shaft In this way two difierent shown in Fig. 3. Bushings 26 26 are fitted on the ends of the shaft to form the bearing surface therefor. Keyed on the center of said shaft is a gear 27, which has projecting ends or hubs, as shown. Loosely journaled on the right hand of said hubs is a gear 28, which has clutch-teeth 29, and loosely j ournaled on the left-hand hub is a gear 30, which has clutch-teeth 31. The right-hand ear 28 is kept in place by a bushin 32, whic is fitted between the right-hand ub of the gear 27 and the right-hand'bushing 26. This bushing is keyed to the shaft 25. A clutch section 33 is keyed to slide on said bushing 32. When the clutch-section 33 is moved to engage the clutch-teeth 29, the gear 28 will be connected to drive the gear 27. A bushing 330 is arranged between the left-hand hub of the gear 27 and the left-hand bushing 26 and is keyed to the shaft 25,. The clutch-section 34 is keyed to (slide on said bushing 330. This clutch-section 34 has teeth on opposite sides thereof, as shown, so as to constitute a double clutch. A pinion or small gear 35 is loosely journaled on said bushing 330, a shoulder being provided to keep said small gear in place. The small gear 35 is provided with clutch-teeth 36 to cooperate with the left-hand clutch-teeth on the double clutch 34. The small gear 35 meshes with the gear 22, the gear 30 meshes with the gear 23, and the gear 28 meshes with the gear 24. These gear-trains are made of different relative ratios, so that the speed im arted from the .shaft 21 to the shaft,25 may e varied by op- .which engage-the grooves of said cams, as

shown in detail'in Figs. 4 and 5. The outer face of the box D is provided with a disk 43, and the shaft 40- has a lever 44, keyed on the 'end thereof. This lever at its end is provided with a 45, which is normally pressed in by a spira spring 46. Fitted on the end of the pin 48 is a knob 47. The disk 43 is provided with a series of six holes, as shown. This operating mechanism is so arranged that when the lever 44 is rotated the earns 41 and 42 will operate the levers 37 and 39 and throw the clutch-sections 33 and '34 alternately into 0 eration in the following manner: When t e lever 44 is moved to osition a, (shown in Fig. 1,) the clutch 33 Wil come into 0 eration and the gear will be connected to rive the shaft 25. When the. lever 44 is moved to osition b, the double clutch-section 34 'will e moved to the right to cause the gear 30 to.

drive the shaft 25, and when the lever 44 is movedto position c the double clutch-section 34 will be moved to the left to cause the small gear 35 to drive the shaft 25. Only one set of clutch-teeth can come in operation at a time. The others being effectively held outof engagement makes it impossible to "get 'any otherresults than that intended when lever 44 has been placed in desired position. The

intermediate holes between the positions 'a b c are arranged so'that when the lever 44- is opposite an sections will be disengaged.

Power is taken from the gear 27 by means of a gear 48, loosely journaledon a stud 49, secured'in'an arm 50, journaled on a hub ,51. The gear 48lmeshes with a g ear 52, secured on a shaft 53 and journaled by-the hub of ear 52 in a frame secured to the front of the athe.- Power maybe taken from-the shaft 53 in ariyof the ways common lathe mechanisms tojactuate either .the lead-screw or feed-rod of the lathe.

By the arrangement above described a simple and effective speed-change gearing is provided between the spindle of the lathe and shaft 53. As two changes are provided in the first arrangement described and'three changes in the second arrangement described,

six different speeds may be given to the shaft 53 relatively to the spindle of the lathe. The arrangement described isone which is sim le and effective and one which can be quic y one of the same all the clutchadjusted by the operator without liability of mistake.

In some cases it is desirable to provide more than three changes between thesecond and third shaft. This is done, as shown in the fourth sheet of drawings, by providing an extra gear 70, fastened on the third shaft and driven from the second shaft by an extra 9,) in providing said gear gear 700, (see Fig. with clutch teet in making both clutchsections double-faced, and in modifying the cams so that'only oneof the four sets of clutches will come into operation at a time. By this arrangement four changes of speed can be obtained between the second and third shafts .or a total of eight between the first and third'shafts. The holding-plate in this case is provided with eight holes, four of which, a, b, c, and d, represent the o erati'veposition s.

The details herein des'cri ed may be greatly varied by a skilled mechanic without departing fromthe scope of my invention as expressed in the claims;

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is-

1. In a change-s eed gearing, the combination of a shaft, a ouble gear turning therewith and arranged to slide axially thereon, an intermediate shaft, three gears fixed-thereon so that either of the first-named gears can be brought into mesh with either of two of the gears on the intermediate shaft, a third shaft,

three gears loosely mounted on the third shaft and meshin with gears on the second shaft, and means for throwing any oneof the last-named gears into operation. f

.2. The combination of a shaft, gears there: on, another shaft, a larger number-of gears loosely arranged on the second shaft, certain of the last-named gears adapted to mesh with the first-named -gears, a third shaft, gears on the third shaft meshing with the gears on the second shaft,- a set of clutch-teeth for each of the gears. on the third shaft, 'clutchesectio'ns on the .thirdshaft, and means for throwing one clutch-section-intoengagement ata' time.

3. The combination of a shaft, gears there* on, another shaft, a larger number of gears loosely arranged on the sa e shaft," certain of the last-named gears adapted to-meslliwith the first-named gears, a third shaftgearson the. third shaft meshing with. the gears? on the second shaft, a. set of clutch-teeth for each of thegears on the third shaft, clutchsections on thethird shaft means for throw-- 'ing one clutch-section-into engagement at a time, and a box in which all said shafts are journaled, said throwing means comprising a shaft, cams thereon, levers between said cams and the clutch-sections, a lever for rotating the camshaft, and a crankarm having a setting-pin, whereby said lever may be held in usted positions, said box having a' series ad' of oles for receiving said pin.

4. The combination of a box, a shaft journaled therein, gears loosely mounted on said shaft, each of said gears having clutch-teeth, clutch-sections keyed to said shaft and arranged to slide thereon, a shaft journaled in said box, cams on said shaft, levers between said cams and clutch-sections, a lever for rotating the cam-shaft, and means whereby said lever may be held in adjusted position, 10 comprising a crank-arm having a setting-pin therein said box having a series of holes arranged cireumferentially into any one of which said pin can be set.

In testimony whereof I have hereunto set my hand in the presence of two subscribing I5 witnesses.

JOHN METCALFE. Witnesses:

LoUIs W. SOUTHGATE, E. M. ALLEN. 

